减小离散误差的时频峰值滤波算法

提出减少时频峰值滤波分段点处阶跃误差的改进方法.经过研究时频峰值滤波在频率调制和时频平面峰值滤波时产生的离散误差以及尺度变换方式,发现分段点处阶跃误差与离散傅里叶变换的长度成反比,且与零点在尺度变换后产生的不确定值有关.提出基于定零点尺度变换的时频峰值滤波,在信号尺度变换时将零点变换到瞬时频率区间上的固定值,使各段时频峰值滤波零点偏移量一致,从而消除分段点处的阶跃误差.仿真实验和实际地震信号时频峰值滤波处理结果表明,改进的时频峰值滤波算法能够有效消减随机噪声,减少分段滤波在分段处的阶跃.     

内蒙古乌拉特中旗乌兰地区含石榴石花岗岩锆石U-Pb年龄及地质意义

对乌拉特中旗鸟兰地区含石榴石花岗岩进行了同位素地质年代学和岩石地球化学研究,探讨了其形成时代和构造背景.利用锆石SHRIMP U-Pb法测得舍石榴石花岗岩岩体的年龄为(256.4±2.2)Ma,表明其形成于晚二叠世;岩石地球化学特征显示属弱过铝质Ⅰ型花岗岩,物源主要为上陆壳硬砂岩,形成于后碰撞构造环境,源区岩浆部分熔融程度较低,可能是由Ⅰ型花岗质流体与岩浆演化后期热液流体反应而分异结晶形成的.根据含石榴石花岗岩产出的大地构造位置、形成环境及侵位时代,推断研究区内华北板块北缘与西伯利亚板块南缘的碰撞缝合时间上限早于256.4 Ma.     

Synthesis and luminescence properties of a novel phosphor Ca2–x/2Si1–xPxO4:Eu2+for near UV-excited white-light-emitting diodes

A novel green-emitting phosphor,Eu2+-doped Ca2-x/2 Si1-x Px O4(0.25≤x≤0.30),was prepared through a conventional solidstate reaction.X-ray diffraction(XRD),photoluminescence(PL) and decay studies were employed to characterize the sample,which was assigned to P63mc space group in the hexagonal system.The effect of P-doping on the α-Ca2 SiO4 was studied and P2 O5 broken down by the raw material of(NH4)2 HPO4 played an important role in stabilizing α-Ca2 SiO4 which can only be stable at high temperature.The XRD patterns of the Ca2-x/2 Si1-x Px O4 host were found pure and optimized when the mole fraction of P2 O5 was 14.5%.The diffuse reflectance spectra of the Ca1.855 Si0.71 P0.29 O4 and Ca1.845 Si0.71 P0.29 O4 :0.01Eu2+covered the spectral region of 230-400 nm,implying that the phosphor was suitable for UV or near-UV LED excitation.The phosphor could be effectively excited in the near UV region with the maximum at 372 nm.The emission spectrum of the Ca1.845 Si0.71 P0.29 O4 :0.01Eu2+phosphor showed an asymmetrical single intensive band centered at 513 nm,which corresponded to the 4f65d1→4f7transition of Eu2+.Eu2+ions might occupy two types of Ca2+sites in the Ca1.855 Si0.71 P0.29 O4 lattice and form two corresponding emission centers,which led to the asymmetrical emission of Eu2+in Ca1.855 Si0.71 P0.29 O4.The effects of Eu2+-doped concentration in Ca1.855-x Si0.71 P0.29 O4 :xEu2+on the PL were also discussed,the optimum doping concentration of Eu2+was 1 mol.% and the critical distance of the energy transfer was also calculated by the concentration-quenching method.The non-radiative energy transfer between Eu2+seemed to be caused by the multipole-multipole interaction.The fluorescence lifetime of Eu2+was found to be 0.55711 μs.The results suggested that these phosphors might be promising candidates used for near UV light excited white LEDs.     

塔里木盆地走滑断裂构造变形特征及油气意义——以顺北地区1号和5号断裂为例

塔里木盆地顺北地区发育一系列中小尺度的板内走滑断裂,断裂带油气富集,但断裂空间结构、断裂演化及其对断控缝洞型储层的控制机理尚不明确。以富含油气的顺北1号断裂与顺北5号断裂为研究对象,对走滑断裂垂向构造样式、平面分段样式、空间结构开展系统研究,并结合生产动态资料深入探讨了走滑断裂构造变形对油气富集的控制作用。基于重要构造变革期及岩性特征将顺北地区古生界地层划分为6个构造层,提出走滑断裂在不同构造层具有"分层变形、分段演化"的构造变形特征。顺北1号断裂垂向构造序列相对简单,深层线性走滑断裂平面分段数少,断裂纵向空间结构组合较简单;顺北5号断裂垂向构造序列复杂,发育一套膏盐岩滑脱构造。"分层变形、分段演化"的构造变形导致断层空间结构复杂,同时走滑断裂在不同构造层中的构造样式对断控缝洞型油气藏成藏要素具有重要控制作用。走滑断裂在平面分段、纵向构造、活动强度和空间结构等方面的差异是导致顺北1号断裂和顺北5号断裂油气差异富集的根本原因。     

基于Web兴城地学岩心库系统的设计与实现

针对目前地学岩心信息管理系统的共享程度和可扩充性低,以及不能方便直观地查看岩心采样信息的问题,提出了基于Web兴城地学岩心库系统,采用MVC框架和数据库技术,并与GoogleEarth结合,实现了对兴城岩心信息的快速查询和有效管理,提高了系统的共享程度和可扩充性,并可以在GoogleEarth中直观地查看岩心采样的信息,实现了资源的信息化,为兴城基地内的地质勘探、岩性等提供服务和支持。     

相控震源一致性评价方法研究

相控震源在煤矿勘探领域广泛应用。针对相控震源非一致性问题,首先介绍了相控震源的工作原理,给出2子站相控信号模型。根据相控震源勘探的精度要求,提出了相控震源一致性评价方法。理论及数值模拟证明,相控震源一致性评价方法准确可靠,能够客观评价相控震源的应用效果,对相控震源应用于煤炭资源勘探与开发具有重要意义。     

油页岩灰渣提取纳米α-Al_2O_3的方法研究

以油页岩为原料合成纳米α-Al2O3,采用表面活性剂超声辅助分散制备氢氧化铝前躯体,再用共沸蒸馏干燥的综合处理制备超细纳米氧化铝,并以共沸蒸馏法干燥,用XRD、TEM、BET进行分析,用热重/差热、红外、XPS进行表征,实验结果表明,所得的纳米氧化铝分散均匀,粒径为50-80nm,表面活性剂超声结合共沸蒸馏的方法对防止前躯体硬团聚很有效。     

基于Web兴城地学岩心库系统的设计与实现

针对目前地学岩心信息管理系统的共享程度和可扩充性低,以及不能方便直观地查看岩心采样信息的问题,提出了基于Web兴城地学岩心库系统,采用MVC框架和数据库技术,并与GoogleEarth结合,实现了对兴城岩心信息的快速查询和有效管理,提高了系统的共享程度和可扩充性,并可以在GoogleEarth中直观地查看岩心采样的信息,实现了资源的信息化,为兴城基地内的地质勘探、岩性等提供服务和支持。     

油页岩灰渣合成Na-A沸石用于去除水溶液中Cu2+（英文）

Na-A zeolite was synthesized using oil shale ash （OSA）, which is a solid by-product of oil shale proc- essing. The samples were characterized by various techniques, such as scanning electron microscopy, X-ray diffrac- tion and Brunaner Emmet Teller method. The batch isothermal equilibrium adsorption experiments were performed to evaluate the ability of Na-A zeolite for removal of Cu （II） from aqueous solutions. The effects of operating pa- rameters, such as concentration of copper solutions, adsorbent dosages, pH value of solutions and temperature, on the adsorption efficiency were investigated. The equilibrium adsorption data were fitted with Langmuir and Freundlich models. The maximum adsorption capacity of Na-A zeolite obtained from the Langmuir adsorption iso- therm is 156.7 mg.g-t of Cu （lI）. The increase of pH level in the adsorption process suggests that the uptake of heavy metals on the zeolite follows an ion exchange mechanism. The batch kinetic data fit the pseudo-second order equation well. The thermodynamic parameters, such as changes in Gibbs free energy （AG）, enthalpy （AH） and en- tropy （AS）, are used to predict the nature of the adsorption process. The negative AG values at different tempera- tures confirm that the adsorption processes are spontaneous.     

大港探区中区油气显微迹象和有机包裹体的荧光显微分析及其应用

文中简介了液烃荧光机理及其在石油地质中的应用,对大港探区中区岩石粒间油气成因的显微迹象进行了荧光显微分析,在此基础上,对该区油气生成、运移、聚集及成藏规律和油气资源进行研究和评价。结果表明,岩石矿物粒间油气成因的显微迹象的荧光显微特征分析研究,是应用有机包裹体研究和评价油气藏的一个重要补充,具有相互印证的作用,并展现出良好的应用前景。